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-rw-r--r--libio/wstrops.c46
1 files changed, 14 insertions, 32 deletions
diff --git a/libio/wstrops.c b/libio/wstrops.c
index 3c9c4971e8..b180a8f9b6 100644
--- a/libio/wstrops.c
+++ b/libio/wstrops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,1997,1998,1999,2001,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1993,1997-1999,2001-2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -67,28 +67,20 @@ void
_IO_wstr_init_static (fp, ptr, size, pstart)
_IO_FILE *fp;
wchar_t *ptr;
- int size;
+ _IO_size_t size;
wchar_t *pstart;
{
+ wchar_t *end;
+
if (size == 0)
- size = __wcslen (ptr);
- else if (size < 0)
- {
- /* If size is negative 'the characters are assumed to
- continue indefinitely.' This is kind of messy ... */
- int s;
- size = 512;
- /* Try increasing powers of 2, as long as we don't wrap around. */
- for (; s = 2*size, s > 0 && ptr + s > ptr && s < 0x4000000L; )
- size = s;
- /* Try increasing size as much as we can without wrapping around. */
- for (s = size >> 1; s > 0; s >>= 1)
- {
- if (ptr + size + s > ptr)
- size += s;
- }
- }
- INTUSE(_IO_wsetb) (fp, ptr, ptr + size, 0);
+ end = ptr + __wcslen (ptr);
+ else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr)
+ end = ptr + size;
+ else
+ /* Even for misaligned ptr make sure there is integral number of wide
+ characters. */
+ end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t);
+ INTUSE(_IO_wsetb) (fp, ptr, end, 0);
fp->_wide_data->_IO_write_base = ptr;
fp->_wide_data->_IO_read_base = ptr;
@@ -96,29 +88,19 @@ _IO_wstr_init_static (fp, ptr, size, pstart)
if (pstart)
{
fp->_wide_data->_IO_write_ptr = pstart;
- fp->_wide_data->_IO_write_end = ptr + size;
+ fp->_wide_data->_IO_write_end = end;
fp->_wide_data->_IO_read_end = pstart;
}
else
{
fp->_wide_data->_IO_write_ptr = ptr;
fp->_wide_data->_IO_write_end = ptr;
- fp->_wide_data->_IO_read_end = ptr + size;
+ fp->_wide_data->_IO_read_end = end;
}
/* A null _allocate_buffer function flags the strfile as being static. */
(((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0;
}
-void
-_IO_wstr_init_readonly (fp, ptr, size)
- _IO_FILE *fp;
- const char *ptr;
- int size;
-{
- _IO_wstr_init_static (fp, (wchar_t *) ptr, size, NULL);
- fp->_IO_file_flags |= _IO_NO_WRITES;
-}
-
_IO_wint_t
_IO_wstr_overflow (fp, c)
_IO_FILE *fp;